I've tried accessing ttyAMA0, ttyS0, serial0, serial1, etc. None of them give me any output. To test, I'm hooking up an ESP8266 that is sending a continuous stream of "Hello" messages. When I do a simple `cat` of the block device on the RPi B, I get data. Nothing happens on the Zero.
Here's my cmdline.txt:
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dwc_otg.lpm_enable=0 console=tty1 root=PARTUUID=700539e0-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
Here are the only uncommented lines from my config.txt:
I've read a few things about needing to disable Bluetooth with an overlay, and I tried a few things, there (I don't remember exactly - that was a few days ago). Still, it seems as if this should be working just fine ESPECIALLY with the SD card image that I `dd`'d from my RPi B.